Brake-shoe.



l W. ARMBRUST.

. BRAKE SHOE.

APPLICATION FILED JAN. 1s, 1911.

` Lmgl, Patented Nov. 28, 1911.

3 SHEETS-SHEET 2.

G. W. ARMBRUST.

BRAKE SHOE. APPLIUATION FILED 11111.18, 1911.

. 1,010,010, Patented 11011.28, 1911.

j 0. W JO s SHEETS-s111121 s.

CHARLES W. ARMEEUST, or cRYsTAL LAKE, ILLINOIS, AssIGNoE or ONE-FOURTHTo SYDNEY STEIN, E CHICAGO, ILLINOIS;

BRAKE-SHOE.

Speccatonof Letters Patent. Patented NOV. 28, 1911.

Application led January 18,. 1911. Serial No. 603,268. 4

To all whom it may concern:

brakeishoes known as wherein the back and face of the shoe are M BRUsT,a citizen of the United States, residing at Crystal Lake, in the county'of Mc- Henry and State of Illinois, (whose postotlice address is No.906 Fisher Building, Chicago, Illinois,) have invented certain new anduseful Improvements in Brake-Shoes,

of which the following is a specication.

My invention relates to brake shoes, and

more particularly to that type or class of interlocking shoes,

. provided with interlocking means, so that a partially worn shoe can bedetached from the brake head and applied to the wearing face of a newshoe, whereby a partially' worn shoe may be completely used up. 4

One of the novel features of my present invention resides in theconstruction, wherein .the interlocking parts on the back and face oft-he shoe respectively are constructved to be engaged in interlockingrelation by moving one of the shoes transversely relatively to theother, and the otherA shoes are so shaped that when interlockinglyengaged, the central portions of the interlocked shoes are spaced apart,`while the end portions thereof are in engagement-with each other. Byreason of this construction the interlocking recesses, with which thecenter of the face of the shoe is provided, mav be made of minimumdepth, thereby enabling the greatestl amount of material to beincorporated in a shoe of predetermined thickness, with the result thatthe shoe possesses a maximum transverse strength.

Another novel feature of this invention consists in eliminating theusual end guide lugs and providing in lieu thereof suitable side stopsadapted to engage with .the outer faces of the brake head end prongs tomain- Itain the shoe in alinement. y v

Various other novel features of construction will be apparent as theinvention is better understood by the following description, when takenin connection with the accompanying drawings illustrating thoseembodiments of mv invention, which appear at the present time to bepreferred.

,Referring to the drawings-Figure `l is a side elevation of aninterlocking shoe, em-

bodying one preferred form of my invenon the line 4-4 of'Fig. 1. Fig. 5is a sectional view on the line 5-5 of Fig. 1. Fig. 6 is an elevation ofa modified form of my invention. Fig. 7 is a top plan View thereof.Fig.- 8 is a face view. F ig. 9 is a sectional view on the line 9-9 ofFig. 6. Fig. 10 is an elevation of still another modification of myinvent-ion. Fig.'l1 is.an' elevation of a modification differingslightly from Fig. 10. Fig. 12 is a plan view of the shoe shown in Fig.11; and Fig. 13 is a sectional mview on the line 13-13 of Fig. l1.

On the drawings 20 designates themain body of a shoe provided on itsback with the integral centrally disposed locking stud 21 havingundercut sides 22 for dove-tail locking engagement with a detachableattaching lug 23. The back of the shoe is also wardly projecting stops27 adapted to cooperate with the sides of the usual end prongs of abrake head to maintain the shoe in alinement thereon. The face of theshoe is provided with a centrally disposedlocking recess 28, havingundercut side walls for l.

locking engagement with the undercut sides of a locking stud 21 on asimilarly shaped shoe. The face of the shoe is also provided adjacentits ends with locking recesses 29 having undercut walls for lockingengagement with the sides of the spacing lugs 24.

It will be evident from Fig. 3that the locking recesses 28 and 29 areopen at one end and closed at the other to prevent lateral displacementof the attached shoe beyond that side of the fixed shoe. the closed endsbeing notched to permit the passage of the side stops 2,7 therethrough.The shoes areV fastened to the brake head with the closed ends of thelocking recesses disposed outwardly. the open ends of the recesses lvingadjacent the flange of the wheel, which is relied upon to -preventlateral displacement of the attached shoe inwardly.

lt will be evident from an inspection of Figs. 1. 6, 10 and 11 that thebacks and faces of the shoes are formed on the arcs of concentriccircles, but that the circles are of different radii, the back of theshoe being "formed on the arc of a circle having a greater radius thanthe circle upon which the face of the shoe is formed. This constructionprovides a -shoe whose face is curved Y apart'is to reduce thetransmission of heat more sharply than its back, so that when two shoesare interlockingly engaged, the -end portions thereof willl lie flushagainst each other, while the central parts will be spaced apart. The'principal reason for forming the shoe so that the centralportions ofinterlocking shoes will be spaced apart when they are interlockinglyengaged is that the loc-king recesses 28 may be made shallower thanwould be possibleif the back and face of the interlocking shoesl layflush against each other throughout their length, to bring the.

from the wearing shoe to the face of the 'supporting shoe as it has beenfound that long'and continued application of a shoe to a wheel sometimesso heats the face of' the sup.

porting shoe that its temper' is injured loefre that shoe has ever beenactually brought vin contact with the surface of the wheel. l

In the modifications disclosed in Figs. 6 to 9 inclusive, the thrustlugs are omitted entirely, while th'e side stops 40 are disposed uponthe sides of the shoe body near its ends, said stops projecting overonto the back'of the shoe, as shown 1n Fig. 7. The face'- of the shoe isprovided with transversely dis. posed recesses 41 into which the sidestops 40 formed on the back of a similar shoe are adapted to fit whenthe shoes are interlocked. In the modiication disclosed in Figf 10 theback of the shoe is equipped with an in tegral attaching lug 50,provided' with the usual key slot while the face'of the shoe .isrecessedvto-a suiiicient width to provide locking engagement between theundercut walls of. the recess and the inclined walls of the attachinglug. The locking'and spacinglugs 52 are alsoprovided in this instanceand the back of the shoe is further provided with transverse spacinglugs 53, which are adapted to insure the maintenance of the properdisltance between the spaced portions of the interlocked shoes. Sidestops 54, are disposed upon the sides of the shoe adjacent its ends,said stops overlapping the back of the shoe similar to the stops 40previously described.

'In the present instance, however, the back' of the shoe between theside stops is cut away at 55 for the reception of the end prongs of thebrake head and the tops of the side stops 54 vare disposed beneath ortangentially to .the curve of the bach of they shoe, so that theprovision of transverse recesses in .the face. v.

13 inclusive, the shoe is equipped with'thevlocking stud 21, previouslydescribed in conf nection with Figs. l and l in lieu of thelin tegralattaching stud shown in Fig. 10, but

the shoe also hasthe transversely. disposed v'spacing ribs 53, thelocking lugs 52 a-nd the side stops 54:. The back of the shoe betweenthe side stops is also cut away similar to the construction 'showninFig. 1Q, but the'ends of the shoe beyond the cut-away portions 55' areraised to provide thrust lugs 56, andthe ends of the face of the shoeare grooved or recessed. at 57 for the accommodation of'v While I haveshown and described'sever-al preferred embodiments 'of my presentinvention, it will be obvious that the invention is not limited to theexact constructions shown but that the -modications are capable' of'various slight changes in 4proportion and\ construction withoutdepartin from the spirit of the invention or sacri cing anyof.'

the material advantages thereof.

I claim:

41. A brake shoe comprising abody' member l.having locking lugs on itsback and locking recesses onits face to interlock with the locking lugsof a similar-shoe, the curvatureV of the face of the shoe being greaterthan the central portions 'of interlocked shoes are spaced apart.'

vcurvature of the back thereof, whereby the i 2. A brakeshoecomprisinAga-body member having a locking stud and .locking lugs on itsback and having locking recesses on its face -adapted tol interlockinglyengage with 'the locking stud and locking lugs of a similar shoe, theback and face ofsaid shoe being formed 'on the arcs of ldifferentcircles,

locking lugs of ajsimilar shoe, the curvature 11`o .whereby to spaceapart the central portions of the face of the shoe being greater than.the

curvature of thev back and said locking irecesses being shallower'thantheir corresponding lugs'whereby the backand face of interlocked shoesarey spaced apartintermediate 4their ends.

' 4:. A brake shoe comprising a body member provided on its back withlocking. lugs and on its face with locking recesses, the curvature ofthe face of the shoe beln'g greater than the curvature of the backthere-l of and the locking recesses being -shallower than thecorresponding locking lugs where, by the interlocked shoes lie againsteach.

. other at their ends but are spaced apart by diderent radii,

the locking lugs intermediate their ends.

5. An interlocking brake shoe comprising a body member, providedon itsback with a centrally disposed locking stud and a plurality of lockinglugs and on its face with recesses adapted to interlock with the lockingstud and lugs of a similar shoe, the back and face of said memberconstituting arcs of concentric circles of dilferent radii, whereby thecentral portions of the interlocked shoes are spaced apart.

6. An interlocking brake shoe comprising a body member provided withlocking lugs and having side stops located on each side thereof, oneface of said member being correspondingly recessed to accommodate thelocking lugs of a similarly shaped member. 7. A brake shoe comprising abody member provided on its back with transversely disposed lockinglugs, side stops located adjacent the ends of said member and projectingupwardly from each side thereof, the face of said member being providedwith transversely disposed locking recesses to accommodate the lockinglugs of a similarly shaped member.

8. An interlocking brake shoe, a body member formed onthe comprising-Whose back and face are arcs of concentric circles of the back of saidmember being provided with transversely disposed locking lugs and sidestops located on each side to engage the end prongs of a brake d and.prevent lateral movement ofthe the face being recessed to receive thelocking lugs of a similarl shaped member, said memberswheninterfbckingly engaged being spaced apart throughout a portion of theirlength. l

9. An interlocking brake'shoe,

comprising provided upon' its back with locking lugs and upon its sideswith stops,

on its face with locking recesses adapted to receive the locking lugs'of a similarly shaped shoe, said locking lugs serving to space saidinterlocking shoes throughout a portion of their length.

10. -A brake shoe, comprising a body member provided on its back andlocking lugs and upon its sides with stops, the tops ofsaid stops beingdisposed tangentially to the curve of the back of the shoe, the face ofsaid member being recessed for interlocking engagement with the 'lock-1ing lugs of a similarly shaped member, the back and face of said memberbeing formed on the arcs of different sizedcircles, whereby the centralportions of the interlocked members are spaced apart.

11. An interlocking brake shoe, com ris-l in g a body-member, providedon its ack with lockmg lugs and upon its sides adjacent the ends thereofwlth stops, the back apart l shoe, the back of said memberbeing recessedbetween Said l lugs located intermediate said attaching lug and the endsof the shoe, the face of said member being provided with recesses toaccommodate the attaching lug and locking lugs of a similar shoe.

13. An interlocking brake shoe, comprising a body. member provided withan attaching lug and interlocking lugs disposed upon either side of saidattaching lug and spaced from the ends of the shoe suiiiciently topermit the end prongs of a brake head to lie outside-said locking lugs.

14. An interlocking brake shoe, comprising a body member provided on itsback with a centrally disposed attaching stud and a'I plurality oflocking lugs and recessed on its face to accommodate the attaching studand locking lugs of a similarly shaped shoe, said attaching stud servingto space the back and face of said interlocked shoes apart.

15. An interlocking brake shoe comprising a-body member provided on itsback intermediate its en ds with a pluralityfof lockwlth the lockinglugs on a similar shoe, each of said recesses being of less depth thanits corresponding locking lug whereby to space the back and face of theinterlocked shoes apart intermediate their ends. 16.' An interlockingbrake shoe comprising a body member provided with a centrally disposedattaching stud and a plurality of locking lugs spaced from the ends ofthe shoe and having on its face interengaging and bearing surfaces ofsaid inter-` s oes. y17. An interlocking brake shoe ing a body memberprovided with a centrally disposed attaching stud and locking lugsdisposed intermediate said stud and the ends of theshoe, the face' ofsaid shoe being recessed to accommodate. the attaching stud and lockinglugs of a similarly shaped and face of said interlocked shoes engagingwith each other adjacent their ends, said attaching stud and locking ugsserving to space mediate their'ends.

locked h comprissaid shoes apart inter- I lugs' adapted to space theshoe body away vCopies of this patent may be obtained for ve cents each,by addressing the Washington. ID. C.

from the brake head, .and provided on its l face-With locking recessesadapted to lockingly engage With said spacing lugs, said lugs and theattaching stud serving to space -the intel-locked shoe bodies apart.

19. A brake shoecornprising a body member having" locking lugs on itsback and locking recesses on its face to interlock With the locking lugsof a similar shoe, said locking lugs .serving to space the interlocked`shoes apart.

shoes apart throughout a portion of their length. y

20. 4A brake shoe comprising a body member having locking lugs on' itsback-and locking recesses on'v its face to interlock with the lookingIugs of a similar shoe, the curvature of the face of the shoe beinggreater than the curvature oi. the back thereof, and the locking lugsserving to space the iuterlocked CHARLES W. ARMBRUST. Witnesses:

IRA J. WILSON,

G. E. HOLMES,

"Gommissioner nt" Patents

